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¿Cómo afectan las actividades humanas el calentamiento global?

El calentamiento global es un término utilizado para referirse al fenómeno del aumento de la temperatura media global, de la atmósfera terrestre y de los océanos, que posiblemente alcanzó el nivel de calentamiento de la época medieval a mediados del siglo
by

maria del mar otalora bonilla

on 21 November 2011

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